Apparatus for producing pure nitrogen.



No. 815,601. v l PATENTED MAR. 20, 190 65 v 011mm. A

APPARATUS FOR PRODUGING'PURB NITROGEN. APPLICATION rum) 001222.19.

A 12 is located in said pipe adjacent to cham- -ber 5 to regulate thepassa e of-liquidair to as. will more y heremafter' ap-- siren; sT TEs.fPATENT .oFFi-on.

- CA L QLIINDE, or MUNICH,- GERMANY, ASSIGNOR or oivn-rrnnnro CHARLES E.BRUSH, or CLEVELAND, OHIO,

' APPA ATUS FOR-P ODUCING PURE NITROGEN. i

' Specification of Letters Patent. 1 Patented March 20, 1.906;

To all whomit may concern:

inzthe Kingdom of Bavaria, Germany, have invented certainnew and usefulImprove My invention merits in -Apparatus for. Producing Pure Ni:trogen; and I do hereby declare-the-following to-be a'full, clear, andexactdescri ".tion of the invention,.such as will enable t ers skilledin the' art to which it usethe same.

appertains toniake and 7 longitudinal section, 1

'-1 repres'ents lined or walled to rovide insulation against pointedoutin-the claims. P a

1 The. accompanyingl ments. 7 r v e g I a casing or receptaclesuitablyheat and made wit a cylindrical inner partilmproved rectifying column-4, which is enehamber3 around-the same. I .Located in the casing 1and'extending practically throughout the length thereof is my tion-wall2 to provide a counter-current larged at its lower end, forminga chamber5,

is provided throughout its length-with superposed trays to overflow'oneinto the next ower, orother form of obstruction or retarding means maybeprovided in said col-- um, and for convenience in explanation of I myinventionl have desi natedlthe upper half of the column 6 and the lower,half 7.

through a coil 9 in a coo g bath 10,;from which the pipe passesthrough'the countercurrent chamber 3 inthe form of a continu of column 4whereit-is provided with a'nozzle. 1-1, projectin into 'columnanddischargvous coil 15 of many convolutions'and then en-' ters chamber 5and iscoiled therein, as shown at i 21-. The ipe leaves the lower end ofchamber 5 an passes up to about themiddle ing downward t erein, and athrottle-valve the column, rea

' Be it known that LOAeL LrNDE, of Munich,

, v relates to an-improved appazra tus for producing pure nitrogen, theobj ect j; of'the'invention being to produ-ce pure nitroi gen by1'ractional distillation and rectification-jof liquefied atmosphericair; and withthis object in view the invention consists in drawing is aviewin' ustrating, my improve- Application filed 0ctober 22, 1903.Serial No. 178,163.

portion of chamber 5, has a throttle-valve 22 Ap'pe 13.communicates withthe upper therein, and extends up to near the top of-- column 41 Itenters said column and coils therein, as shown at 14, and then passesout 6o:

of the column and is coiled within the pipe 15,

as shown at 161, and'out at the top and communicates with a. suitablesuction-pump 17.

a A pipel18 connects the top of. column 4 '1 with the bottom ofcounter-current'chambef g 3, and an outlet-pi e 19 communicates withcommunicates. with nozzle 1 1 to supply liquid air thereto in startingthe apparatus and I to compensate for losses in wor 'The operation of myimprovementsils as folloWsz-Air is com ressed b compressor 8 and cooledin the 00119 in bat 10 and enters the] coil in counter-current chamber3, ex -o changing its temperature with the escaping" currents andliquefies in coil 21 in chamber 5.

e ,vapor passing up through the lower half tains about sixty per cent.oxygen it will escape through. the top of column 4 with put of co1umn4incounter-current to the li uid hair descending, rectificationsets in,so t at while the vapor leaving the chamber 5 con- 5 seven per cent.oxygen. Pipe18 conveys this vapor to the counter-current chamber 3,1'r0mwhich it escapes through the outlet 19. The excess of l quid inchamber'5 is drawn up past valve 22 to coil 14 by means of'suctionpump 17, thusmaintaining the liquid in 8 represents an air-com ressor to forceairvacuo. The rising vapors with seven per cent. oxygen exchange their heatwith the place} so that the vapor esca'p I ing from the top of column-.4will contain but o about two and one-half per cent. oxygen, and

by continued iopera-tion' of the apparatus finally pure nitrogen onlyescapes outof column 4 through counter-current chamber 3 and outlet 19.-The liquid vaporized in 'vacuo in coil 14 is'drawn through the innerused again,if desired.

pipe-coil 16' in chamber 3 and escapes or may the upper end of saldchamber 3. A pipe 20 Theair so liquefied'flows past valve 12 to v i Agreat many slight changes might be -made in the generalform andarrangement of the parts described without de arting from my invention,and hence I wou d have it understood that I do not confine myself to theprecise details set forth, but consider myself at liberty to make suchslight changes and alterations as fairly fall within the spirit andscope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In an apparatus for producing pure ni trogen, the combination of arectifying-column, a liquefied gas-chamberat the bottom thereof, anozzle discharging liquefied gas into-sald column between 1ts ends,means for carrying ofi the nitrogen at the top of said column, a pipecommunicating with the liquid-chamber at the bottom of the column, andcoiling in the upper portion of said column and means for drawing aquantity of a said liquid through the coil, whereby it is vaporizedtherein "in vacuo and a corresponding' qgiantity of the gas in saidcolumn liquefied y its contact with the metal walls of said coil. 4

' 2. In an apparatus for producing pure nitrogen, the combination with.a gas-compressor, a coil through which the gas is forced, means forcooling the coil and a counter-current chamber into which the cooled gasis conveyed, of a rectifying-0011111111, a chamber for liquefied gasat'the lower end of said column, a coil therein in which the gas fromthe counter-current chamber is liquefied and evaporates a corresponding(uantity of liquid in the liquid-chamber t 1e vapor from which ascendsthrough the column, a pi e a the counter-current Cllfilllbtl'.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

CARL LINDE.

Witnesses:

ABRAHAM ScnLEsIxGER, ANNI LUTHER.

